How was the "time bomb" of swine flu detonated?

(agricultural Wealth net) how did the time bomb of swine flu detonate? -- is that so?-- heh-- We have to face such a strange circle: disease-- medication, Vaccines-- new diseases-- new drugs, vaccines. Human as virtue rises one foot, virus vice rises ten, and the struggle between mankind and the virus flood have stepped into the misunderstanding and danger of constantly building high flood control dams. Over time, the virus flood is shaped like a suspended river, hanging high above the head of human health. If there is any carelessness, it will be destroyed. Abuse of drugs and vaccines, damage to the environment, not only make medical efforts in vain, this kind of dike-like passive defense, people are tired and unsafe. In a way, swine flu is actually a virus "time bomb" planted by human beings themselves. -- now I see-- all right, ha-- -Why are you back?-that's good. Oh, ha-- it's all from me.